Temperature-maintaining vessel



1,560,375 A. E; BLACKMAN TEMPERATURE MAINTAINING VESSEL Nov. 3 1925 Filed Sept- 23. 1924 Patented Nov. a 9

sra'rns PATENT crates.

I TEMPERATURE-MAINTAINING VESSEL.

Application filed September 23, 1924. Serial No. 739,403.

To all whom it may concern:

Be it known that I, ARTHUR EDWARD BLAGKMAN, asubject of the King of Great Britain, residing at Franklin, in the State of Tasmania, Commonwealth of Australia,

having invented certain new and useful Tmproveinents in and Connected with Temperature-hlaintaining Vessels do hereby declare that the following is a specification.

c This invention relates to the construction of temperature maintaining vessels such as thermal flasks and has for its object to provide for a less fragile article, as when the flask is made of glass, and for more cflec- .5 tively maintaining the temperature therein whether such temperature resides in a hot or cold substance.

In this invent-ion, the inner vessel or retainer is made of rustless steel and highly polished to minimize conduction. The metal shell is also of advantage in that it may v be made thinner than a glass shell.

Experiment has shown that in flasks hitherto made the losses by conduction 2 mostly occur through the neck of the flask, and as steel, and particularly highly polished steel, is a bad conductor of heat, it follows that if conduction near the neck can be minimized, a satisfactory vessel will be provided that will retain food substances for a long time at their predetermined temperatures.

A. further object-of this invention is to so construct the neck and cap of the flask as to safeguard the tendency to losses by conduction. ,partlyoccupy the annular space about the neck of the flask with an inset of steel foil, \l-shape in section. One such inset, but ineo. verted, is in the container of the flask cap and the other. in the] flask container, both the cap and container being insulated, in vacuo, in the ordinary way. When the cap is screwed down the bases of said insets will a be coincident and'operate to more effectively avoid leakages through the joint between the insulated cap and body. The steel foil, insets may be suitably reinforced and supported to reduce torsional strains thereon.

In the accompanying drawings Fig. 1 is a longitudinal sectional elevation of the improved flask.

' Fig. 2 is a sectional plan of same on line AB of Fig. 1, and

Fig. 3 is a sectional detail of the reinforctit ing means.

With this object, therefore, I

The flask or retainer 4 is made ofrustless steel and highly polished. It seats in its container 5 on asbestos chocks 6 of whichthere are, say, three that are connected together by the wires 7 The flask has a. cap 8 that is within the cap container 9 between which and the cap are'like asbestos checks (5 and wires 7. A vacuum is maintained within each of the containers in the usual way. The cap 8 screws on to the flask 4t through the worm 10.

It will be observed that the flask cap 8 continues downwards through the worm and term nates, after being turned outwards, to provide a flange 12, opposite a. like inwardly turned flange on the cap'container 9. The wall of the flask d is bent upon itself and turned over through the worm and bent to provide a flange 12 just below the flange of the cap 8 while the wall of the container 5 is likewise inwardly disposed. This arrangement leaves a space to be bridged and closed in the container cap 9 and the container 5 by a heat non-conducting material it the vacuum in each is to bemaintained. This can be effected by means. of the strips 11 of steel-foil arranged annularly about the flask neck, 1n the member 9 in section like an inverted \11, and in the container 5 annuflarly in section like the letter V so that,

when the parts 9 and 5 are screwed together the bases of the V-shaped parts are coincident. The legs of each member 11 are so curely attached to the aforementioned In operation, the cap container 9 is screwed off the worm 10 to leave the cork 13 exposed: this is then withdrawn to obtain access to the flask which, when filled, is recorked and the cap again screwed on. Be tween the parts 9 and 5 are ruberoid or other like washers 14 that further assist in completing the joint.

The annular V members, being attached to the flanges 12 are subjected to certain.

z torsional strains when the cap container is manipulated. To stay said members it have provided a cleat 15 at, say, four points around the member 9 and at a like number of points around the container 5, preferably llltl integral therewith. ""Tli'e washers 14 are each made witha knuckle-:16 against whlch "the flanges" of the parts 9 and 5 and the cleats come toa neat fit' so far as the container 9 is'concerned, when the container cap is screwed home. To "the cleats 1n the container 5 silken cords,17 are attached and cap 8.

taken and secured to the flaskfi while the" cords in the'c'a'p: containerzare attached to the cleats andf taken :and'secujred to the flask,

Thus, a flask is providedof less fragile:

, nature than glass and one intowh-ioh-very fracture.

hot liquids can be poured without .risk of The improved flask will also be I claim as" new and desire to secure by Letters Patent is r i -.1. ,Inflasks ofljthekindindicated, an inwardly flanged vacuum container in which a rust-less. steel highly polished. flaskis placed,

a turned overf'worm' threadedlneck to the flask, a vflange thereon opposite its container flange, a capv to the flask having a worm and a flange on its lower edge, a vacuum container over the cap", an inwardly turned flange on the capcontaineropposite that-on the cap, annular members of steel foil V- Y shapedfi'n sectionin, thercontainer and cap container respectively secured'to the flanges and filled with glass wool and ruberoid container.

washers between the' cap container and the 2. In flasks of the kind indicated, an in- .wardly flanged vacuum container in which a rustless steel highly polished flask is placed, a turned over worm threaded neck to the flask, a flange thereon opposite its container flange, a cap to the flask having a worm and a flange on its lower edge, a vacuum container over the cap, an inwardly turned flange on the cap container opposite that on the cap, annular members of steel "yfoil V-shap'eddn sectionin the container and capcontainer respectively secured to 1 the flanges and filled with glass wool, ruberoid washers between the cap container and the container, and means for staying said annular members against torsional strains.

In flasks of the kind indicated, an inwardly flanged vacuum container in which a rustless i steel highly polished flask is placed, a turned over worm threaded neck to the flask,- a flange thereon op osite its container flange, a cap to thefias having a worm and a flange. on itslower edge, a

vacuum container over the cap, an inwardly turned flange on the cap container opposite that on the cap, annular members of steel foil V-shaped in section in the container and cap container respectively secured to the flanges and filled with glass wool, ruberoid washers between the cap container and the container, means for staying said annular members against torsional strains, asbestos chocks between the flask and its container and the flask cap and container and light wires. between and linking up said chocks.

In witness whereof I aflix my signature.

ARTHUR EDWARD BLACKMAN. 

